Hydraulic jack



May '15, 1923.

, v A. PAOLl rIYDRAULIC JACK Filed July 20 1921 I/WE/l/TOR I Paw Z 2 By WW (Q ATTORNEYS 30 maintaining theair pressures on the inner and outer walls of a liquid-holding recepn t curios-,-

ARTHUR PAOLI, 01E HANCOCK, MICHIGAN.

.HYDRAULIC JACK.-

Application filed J'uly 20, 1921. Serial No. 486,128.

To all whom it mayconcern.

Be it known that I, ART UR PAoLI, a citizen ofthe United States, and a resident of Hancock, in the county of Houghton and State of Michigan, have invented a new and useful Improvement in Hydraulic Jacks, of

which the following exact description.

My invention relates to hydraulic jacks, and it consists in the combinations, constructions and arrangements herein described and claimed.

An object of my invention is to provide an improvement over the hydraulic jack disclosed in my prior application for patent.

is a full, clear, and

Serial No. 473,764,,filed May 31. 1921. said improvement consisting in the provision of'anovel means for controlling the passage of a liquid used in the device from the working cylinder thereof to the liquid-holdv ing receptacle.

A further object of my invention is to provide a device of the character described having an auxiliary work-engaging member'arranged .to be moved into operative position at will, whereby work imay be raised to a height greater than is usual when a jack of a given size is used.

A further ob ect of my invention is to provide a hydraulic jack having means for tacle balanced. e

Other objects and advantages will appear in the following specification, and the novel features of the invention will be partied larly pointed out in the appended claims;

My invention is illustratedin the accompanying drawings, forming part of this application, in which Figu screws 4, or like fastening mean'aso as to provide a liquid-tight connection with the latter. The casing 1, together with the basei2, constitute ameceptacle adapted to receive a liquid which may be'introduced thereinto through a threaded filler opening- 5 in the upper wall 6 of-the casing. The filler opening 5 is normally closed by plugs -7. The latter is formed with passages 8 and 9 extending the entire-length thereof. The passageS is enlarged at 10 adjacent to the outer end of the plug 7 to provide a seat for an outwardly opening ball valve 11. An expansion spring 12 is disposed in the enlarged portion 12 of the passage 8 between the ball valve 11 and a perforated plug 13 having a threaded engagement with the passage 12 and tends to hold the valve 11 on its seat, The assage 9 is enlarged at 13 adjacent to the inner end of the plug 7 to provide a seat for an inwardly opening ball valve 1-1. The latter is normally held on its seat by the action of an expansion spring 15 which is maintained within the enlarged portion 13 of the passage 9 by a perforated plug 16, as best seen in Figure 3. The passages 8 and 9 are equal in diameter and the perforations in the plugs 13 and 16 are likewise of the same diameter, whereby the air pressures on the inner and outer .walls of the liquid-holding receptacle will be balanced.

As in the device disclosed in my aforesaid prior application for patent, a vertical cylinder 17 is projected through an opening 18 in the upper wall 6 into engagement with a portion 19' of the base that protrudes withinthe casing 1. It will be cylinder 17 with the portion 19 is such as to provide a liquid-tight connection beween these parts. The cylinder 17 fits the opening 18-closely so. as to prevent leakage of the liquid from the receptacle atthis point. A ram or plunger 19 is arranged for reciprocation within the cylinder-17. Al pump casing 20 is projected through an opening '21 in the upper side of the receptacle into a socket 22 in the portion 19' of the base 2.,

from the cylinder 17 to the inlet passage 26..

The. latter'is reduced at its lower end as at 29 to provide a .seat for a ball valve 30.

understood that the engagement of the inder 17 through the upper portion 19 of the latter.

the base 2"to a vertical valve bore or chamber 33 in the upper portion 19. It is to be observed that the exhaust passa e communicates with the chamber or bore 33 intermediately of the length of the latter and that a valve 34 normally closes the chamber 33 at its upper end. The valve 34 has a relatively reduced depending portion 35 enlarged at its lower end to provide a plunger 36 reciprocatively disposed in the chamber 33 below the junction of the latter with the exhaust passage 32. A tubular member 37 is vertically disposed within the receptacle and has a screw-threaded connection as 11638 with anannular flange or boss 39 surrounding the orifice of the chamber 33.

The valve 34 has a stem 40 extending vertically through the tubular member 37 and through an opening 41 in the upper wall 6 to project exteriorly of the latter. The upper wall-6 is formed with an outwardly extending boss 42 threaded exteriorly at 43 for engagement with a cap 44 having a central opening through which the stem 40 projects. The boss 42 is provided with a relatively large. central opening 45 surrounding the stem 40, in which a spring 46 is disposed.

The latter reacts at its ends against the cap and a disk 47 mounted on the stem 40, whereby the valve 34 is normally held against its seat. A lever 48 is pivotally attached intermediately to the upper end of the stem 40 and is fulcrumed at one end on an extension 49 tothe outer wall of a casing 50 that has a screw-threaded connection at 51 with a socket 52 in the upper wall 6 and concentric with the opening 18. The casing50 has an inner diameter greater than the outer diameter of the cylinder 17 and is ofa length to extend sl ilghtly "above the upper end of he casing 50 has an inwardly extending flange 53 adapted to receive the plunger 19 and to overlie a packing member 54 that rests upon the upper end of the cylinder 17. The arrangement of the casing 50 with respect to the cylinder 17 provides an annular passage 55 which has an inlet 56 leadin thereinto from the cylinder 17 and an out et 57 through the upper wall 6 into the liquid-holding receptacle.

A work-engaging member 58 is carried by the plunger 19 and has a depending arm 59 adapted to support a work-supporting foot 60. The latter is slidably mounted as shown. An auxiliary work-engaging member 61 has arms 62 arranged to straddle a laterally projecting portion of the work-engaging member 58 and attached to the latter by means'of' a pintle 63. The auxiliary work-engaging member 61 may be moved into the position when a jack of a given size is employed.

When desired, the auxiliary work-engaging member 61 may be swungdownwardly about the axis of the pintle 63 to hang against the casing 50 and out of operative position. The work-engaging member 58 is preferably serrated as at 64 and the auxiliary work-engaging member 61 is likewise serrated or formed in any other suitable known manner at its ends to engage with the work. The valve stem 40 is connected with the work-engaging member 58 by a cable 65 which may be a chain, as illustrated. The pump plunger 24 is provided with an operating lever 66 connected by a link 67 with a lug 68 on the upper wall 6. A handle 69 is provided with a socket 70 adapted to receive the outer end portion of the lever 66. A pin 71'protruding from the lever 66 is arranged to enter recess 72 in the wall of the socket 70 and to engage with a shoulder 73 defined by the recess, whereby the handle 69 is normally prevented from disengaging the lever 66. It will be observed that the socket 70 is of a size sufiicient to permit .thelever66 to be loosel "received therein and. the handle 69 may e detached from the lever 66 whengrasped and raised relatively to the. latter.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. An operating fluid is forced into the-cylinder 17 when the pump plunger 24 is operated in the manner described in my-aforesaid application for patent, whereby the ram 19 will be raised to a desired height. The ram 19 has a vertical slot 74 extending to a dethe inner wall of the cylinder 17 into a vertical guide slot 7 6 in the outer wall thereof. When the lower end of the ram 19 has been raised above the level of the inlet opening -56, the operating fluid will pass through the latter into the annular passage 55 and thence through the outlet 57 to the receptacle. Consequently, the ram 19 cannot be moved out of engagement with the cylinder 17 Since the passage 50 is annular in form, the possibility that'the same ma in service, on account of t e presence of sediment in the operating fluid, or on account of any other reason, is reduced to a minimum. The provision of the inwardly extending flange 53 overlying the packing member 54 prevents the passage of dust into the passage 50 and into the cylinder 17. thereby obviating the necessity of providing a dust cap that must ordinarilybe pro:

vided in devices of a like character, of which I am aware. I also provide auxiliary means to insure a return flow of the operating fluid 65 illustrated in Figure 1, whereby work may 7 from the cylinder 17 to the-reeeptacle when be obstructed 37. The valve 34 will be lifted from its seat when the outer end of the lever 48 is lifted. It is important to note that the operatin fluid passing into the receptacle from the cylinder 17 must first entirely fill the vertically disposed tubular member 37 before flowing into the receptacle proper. In practice, it has been found with an ordinary device that a considerable amount of air is pumped into the cylinder Withthe operating fluid and that this air is compresed during the operation of the device. In consequence when the valve controlling the flow of the operating fluid from the cylinder to the receptacle is moved into open position, the rush of the compressed air into the receptacle will thoroughly agitate the fiuid in the receptacle and even vaporize part of the latter, whereby theoperating fluid is forced through any outlet provided for the escape of air from the receptacle. If no outletis provided for that purpose, the further operation of the device is seriously affected. I have found that the provisionof the tubular member 37 obviates this difiiculty as the operating fluid passes into the latter, the' air is permitted to pass from the upper end of the tubular member and thence directly through the passage 8 without acting on the liquid within the receptacle. Since the valve 34 has a depending extension provided with the plunger 36, the pressures on the valve 34 and on the plunger36 will be balanced and consequently the pressure of the operating fluid within the cylinder 17 and filling the exhaust passage 32 does not tend to movethe valve 34 from its seat, as in the case of similar devices of which I am aware.

he base 2 may be providedwith reenforcing ribs 7.7, as shown. I claim: 4

1. A device of the character described comprising a cylinder closed at one end, a movable ram projecting from the other end of the cylinder, a work-engaging member carried by the ram at its outer end, and an auxiliar work-engaging member attached to the rst named workcngaging member and movable at will into alinement with the ram or laterally of the latter.

2. A device of the character described comprising a Working cylinder closed at one end, a ram operatively mounted in the cylinder and arranged to project from the other end of the latter, means for supplying an operating end, an exhaust conduit communicating with the cylinder at its closed end, means for controlling the passage of a liquid from the cylinder through the exhaust conduit, and means connecting the said controlling means and the ram to occasion an operative movement of the controlling means when the ram is moved outwardly in the cylinder a predetermined distance.

3. A device of the character described comprising a working cylinder closed at one g end, a ram operatively mounted in the cylinder and arranged to project from the other end of the latter a work-engaging member carried by the ram at its outer end,

means for supplying an operating fluid to the cylinder at its closed end, an exhaust conduit communicating with the cylinder at its closed end, normally closed manually operable means for controlling the discharge of a liquid from the exhaust conduit, and a cable connecting the controlling means with the work-engaging member for moving the controlling means into open position when the ram has been moved outwardly a predetermined distance.

4. A device of the comprising a casing provided with a base, said casing and said base being arranged to coact to provide a liquid-holdingreceptacle. a-vertical cylinder arranged to de-' pend within the casing and to have a liquidtight connection at its lower end with said base, a ram operatively mounted in the cylinder, means operable at will for supplying an operating liquid from the receptacle to the cylinder at the lower end of the latter, said base being provided with an exhaust passage communicating at one end with the cylinder at the lower end of the latter and with a valve chamber communicating intermediately with the haust passage, said valve chamber being arranged to communicate at its outer end with the liquid-holdingreceptacle, and a manually operable valve normally seated at' the outer end of the valve chamber and provided with a stem projecting exteriorly of the casing, said valve being provided with a relatively reduced portion depending into nection at its lower end with said base, a

ram operatively mounted in the cylinder, means operable at will for. supplying an operating liquid from the receptacle to the fluid to the cylinder at its closed character described outer end of the excylinder at the lower end of the latter, base being provided with 'an-exhaust pascommunicating at one end with the cy inder at the lower end of the latter and "with a valve chamber communicating intermediately with the lower end of the ex-' haust passage, said valve chamber being arranged to communicate at its outerend with the li aid-holding receptacle, a manually operab e valve normally seated at the. outer end of the valve chamber and provided with astem projecting exteriorly of the casing, said valve being provided with a relatively reduced portion depending into the valve junction of the chamber and enlarged at its ends'below the exhaust passage with the valve chamber, and flexible means connecting the outer. end of the valve stem with the outer end of the ram.

6. In a device of the character described, a liquid-holding receptacle provided with a filler opening, a closure for the opening, said closure being provided with similar longitudinally extending passages extendingprovided with said perforated plug for each passage, said plugs being arranged 'to retain said ball valves within the passages. I .7

7. A device of the character described comprising; a casing provided with a base, said casing and said base'being arranged to 'co-actto provide a liquid-holding receptacle, a vertical cylinder arranged to depend within the casing and to havea liquidtight connection at its .lower end with said base, a ram'operatively mounted in the cylinder, means operable at Will for supplying an operating liquid from the receptacle to the cylinder at the lower end of the latter, said base being provided with an exhaust passage communicating at one end with the cylinder at the lower end of the latter and with a valve chamber communicating interinediately with the outer A .end of the exhaust passage, said valve chamber being arranged to communicate at its outer end with the liquid-holding receptacle, a manually operable valve'normally seated at the outer end of the valve chamber and a stem projecting exteriorly ofthe casing, and a vertically extending tubular member disposed :within the receptacle in concentric relation to the valve chamber, said last named tubular member having a liquid-tight connection at its lower end with the base.

- ARTHUR PAOLI? i 

